D Ring Seals

D Ring Seals for rotary and reciprocating dynamic applications

M Barnwell Services are the largest independent manufacturer, stockist and distributor of fluid sealing products in the UK. With 50 million D Ring Seals, O Rings and Back-Up Rings in stock we supply to over 5000 customers globally every month – quickly and reliably.

D shaped rubber seals present alternative elastomer solution to O Rings for use in rotary and reciprocating dynamic applications. They present identical sealing features as an O Ring. For high and low-pressure applications through a wide span of temperatures, D Rings are ideal.

D rings can usually be, therefore, retrofitted into existing O Ring groove, the size is frequently established around the original O ring dimensions. The flat surface on the foundation of the D Ring ceases the seal from rotating and twisting, averting spiral failure frequently observed when O Rings are used in reciprocating applications. D Rings can be produced to typical O Ring sizes also as bespoke sizes for a particular application.

A collaboration of a low modulus material and small cross-section can assist to decrease friction in low-pressure applications. Selecting a higher modulus material with a lowered ratio of friction can decrease friction in high-pressure applications.